Marine Weather Net

Straits of Florida from west end of Seven Mile Bridge to south of Halfmoon Shoal out 20 to 60 NM Marine Forecast


TODAY

ENE
WINDS
10
KNOTS

TONIGHT AND THURSDAY

ENE
WINDS
10
KNOTS

THURSDAY NIGHT

SE
WINDS
5 - 10
KNOTS

FRIDAY

SSE
WINDS
5 - 10
KNOTS

The Marine Weather Forecast In Detail:
GMZ074 Forecast Issued: 429 AM EDT Wed Jul 08 2020

Today...Northeast To East Winds Near 10 Knots. Seas 1 To 3 Feet. Isolated Showers And Thunderstorms.
Tonight And Thursday...Northeast To East Winds Near 10 Knots. Seas 1 To 3 Feet. Isolated Showers And Thunderstorms.
Thursday Night...Southeast Winds 5 To 10 Knots. Seas 1 To 2 Feet. Isolated Showers And Thunderstorms.
Friday...Southeast To South Winds 5 To 10 Knots. Seas 1 To 2 Feet. Isolated Showers And Thunderstorms.
Friday Night...South To Southwest Winds 5 To 10 Knots. Seas 1 To 2 Feet. Isolated Showers And Thunderstorms.
Saturday...Southwest To West Winds 5 To 10 Knots. Seas 1 To 2 Feet. Isolated Showers And Thunderstorms.
Saturday Night...Variable Winds 5 To 10 Knots. Seas 1 To 2 Feet. Isolated Showers And Thunderstorms.
Sunday...South Winds 5 To 10 Knots. Seas 1 To 2 Feet. Isolated Showers And Thunderstorms.
Sunday Night...Southeast Winds 5 To 10 Knots. Seas 1 To 2 Feet. Isolated Showers And Thunderstorms.
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Synopsis for Keys coastal waters from Ocean Reef to Dry Tortugas: GMZ005
429 AM EDT Wed Jul 8 2020

A western Atlantic ridge axis aligned across the southern half of the Florida Peninsula will move back south across the Florida Keys and weaken for the balance of this week and weekend. This will result in light to gentle winds for the balance of this week and weekend.

Gulf Stream
The Approximate Shoreward Edge of the Gulf Stream as of July 2...
- 20 NM South of Dry Tortugas Light...on Loggerhead Key.
- 24 NM South of Cosgrove Shoal Light...off the Marquesas Keys.
- 28 NM South of Sand Key Light...off Key West.
- 34 NM South of Looe Key...off Big Pine Key.
- 37 NM South of Sombrero Key Light...off Marathon.
- 11 NM Southeast of Alligator Reef Light...off Islamorada.
- 8 NM Southeast of Molasses Reef Light...off Key Largo.
- 8 NM East of Carysfort Reef Light...off Ocean Reef.
Area Forecast Discussion
National Weather Service Key West FL
410am EDT Wednesday July 8 2020

During the overnight period, several lurking boundaries have become convectively active with scattered showers and isolated lightning storms along the Lower and Middle Keys and the adjacent nearshore and offshore waters out 40 nm. Currently, skies are variably cloudy with temperatures in the lower to mid 80s away from any downpours along the island chain. On our marine district, winds are north to northeast at 5 to 9 knots except slightly higher on the Straits of Florida.

Short Term - Today Through Friday Night
A split ridge of high pressure, with one well defined cell in the Southeast Gulf of Mexico and the second well east of the Bahamian chain, will result in light and variable low level winds below 700 mb. This splintered ridge axis will be in response to a gradually developing low pressure system in the extreme Southeast United States, with a trough reaching well south and down the Florida Peninsula. Without any large scale lift or low level undulation, light winds along with drier air filtering to our region beginning this afternoon and persisting through this week. Hence, only 10 to 20 percent rain chances which is slightly higher than a blend of ECS/MAV MOS guidance. However, despite the drier air expected and below climo rain chances, mesoscale forcing in the form of cloud line genesis and cells migrating off the South Florida Peninsula will be the precipitation sources.

Long Term
(Saturday through Tuesday) With our region lying between a nebulous ridge axis lying near the Straits of Florida and the southern extent of a trough reaching into extreme South Florida lifting northward, the combination of limited moisture, an absence of a foreseen discernible low level perturbation or large scale ascent, 10 to perhaps a brief spell of 30 percent rain chances will be inserted through this forecast cycle.

Marine
Light to gentle winds will prevail on all Keys coastal waters for the balance of this week and weekend.

Climate
In 2012, the daily record rainfall of 2.00 inches was recorded in Key West. Precipitation records have been kept since 1871.

NOAA Key West FL Office: Watches - Warnings - Advisories
FL...None. GM...None.